Switching from a big side-wheel to a comma

I've decide to switch to using a comma on my Nikko Diamond-

lower profile - easier to store and zip up the rifle case -

wondering if anyone has some nice printed range tapes with distance markings
that will correspond to a big Nikko for rangefinding?

looking for something like this :


I've also noticed that in order to see the distances accurately you must have the rifle straight, level and true
and be almost looking through the scope at the correct angle .... anything else gives odd or incorrect ranging

I guess it's just gonna take some getting used to ....
cheers
James